<template>
  <div class="tags-view-container">
    <jt-scroll-pane class='tags-view-wrapper' ref='JtScrollPane'>
      <router-link @dblclick.native="closeSelectedTag(tag)" ref='tag' class="tags-view-item" :class="isActive(tag)?'active':''"
        v-for="tag in Array.from(visitedViews)" :to="tag.path" :key="tag.path" @contextmenu.prevent.native="openMenu(tag,$event)">
        {{tag.title}}
        <span class='el-icon-close' @click.prevent.stop='closeSelectedTag(tag)'></span>
      </router-link>
    </jt-scroll-pane>
    <!-- <ul class='contextmenu' v-show="visible" :style="{left:left+'px',top:top+'px'}">
      <li @click="closeSelectedTag(selectedTag)">关闭</li>
      <li @click="closeOthersTags">关闭其他</li>
      <li @click="closeAllTags">关闭所有</li>
    </ul> -->
  </div>
</template>

<script>
  import JtScrollPane from '../jt-scroll-pane/index';
  export default {
    components: {
      'jt-scroll-pane': JtScrollPane
    },
    data() {
      return {
        visible: false,
        top: 0,
        left: 0,
        selectedTag: {}
      }
    },
    computed: {
      visitedViews() {
        return this.$store.state.tagsView.visitedViews
      }
    },
    watch: {
      $route() {
        this.addViewTags()
        this.moveToCurrentTag()
      },
      visible(value) {
        if (value) {
          document.body.addEventListener('click', this.closeMenu)
        } else {
          document.body.removeEventListener('click', this.closeMenu)
        }
      }
    },
    mounted() {
      this.addViewTags()
    },
    methods: {
      generateRoute() {
        if (this.$route.name) {
          return this.$route
        }
        return false
      },
      isActive(route) {
        return route.path === this.$route.path || route.name === this.$route.name
      },
      addViewTags() {
        const route = this.generateRoute()
        if (!route) {
          return false
        }
        this.$store.dispatch('addVisitedViews', route)
      },
      moveToCurrentTag() {
        const tags = this.$refs.tag
        this.$nextTick(() => {
          for (const tag of tags) {
            if (tag.to === this.$route.path) {
              this.$refs.JtScrollPane.moveToTarget(tag.$el)
              break
            }
          }
        })
      },
      closeSelectedTag(view) {
        this.$store.dispatch('delVisitedViews', view).then((views) => {
          if (this.isActive(view)) {
            const latestView = views.slice(-1)[0];
            if (latestView) {
              this.$router.push(latestView.path)
            } else {
              this.$router.push('/main/home/backlog');
              this.$emit('initHeaderNavbarActiveIndex');
            }
          }
        })
      },
      closeOthersTags() {
        this.$router.push(this.selectedTag.path)
        this.$store.dispatch('delOthersViews', this.selectedTag).then(() => {
          this.moveToCurrentTag()
        })
      },
      closeAllTags() {
        this.$store.dispatch('delAllViews')
        this.$router.push('/')
      },
      openMenu(tag, e) {
        this.visible = true
        this.selectedTag = tag
        this.left = e.clientX
        this.top = e.clientY
      },
      closeMenu() {
        this.visible = false
      }
    }
  }

</script>

<style scoped>
  .tags-view-container .tags-view-wrapper {
  background: #fff;
  height: 38px;
}
.tags-view-container .tags-view-wrapper .tags-view-item {
  display: block;
  position: relative;
  height: 30px;
  line-height: 30px;
  border-bottom: 1px solid #d9dadb;
  border-right: 1px solid #d9dadb;
  color: #495060;
  background: #e7ecf2;
  padding: 2px 8px 0 15px;
  font-size: 14px;
  float: right;
}
.tags-view-container .tags-view-wrapper .tags-view-item.active {
  background-color: #fff;
  color: #495060;
  border-bottom: none;
  padding-left: 8px;
}
.tags-view-container .tags-view-wrapper .tags-view-item.active::before {
  content: "";
  background: #fff;
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  position: relative;
  margin-right: 2px;
}
.tags-view-container .contextmenu {
  margin: 0;
  background: #fff;
  z-index: 100;
  position: absolute;
  list-style-type: none;
  padding: 5px 0;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 400;
  color: #333;
  box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, 0.3);
}
.tags-view-container .contextmenu li {
  margin: 0;
  padding: 7px 16px;
  cursor: pointer;
}
.tags-view-container .contextmenu li:hover {
  background: #eee;
}
</style>

<style>
.tags-view-wrapper .tags-view-item .el-icon-close {
  width: 16px;
  height: 16px;
  vertical-align: 2px;
  border-radius: 50%;
  text-align: center;
  transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
  transform-origin: 100% 50%;
}
.tags-view-wrapper .tags-view-item .el-icon-close:before {
  transform: scale(0.6);
  display: inline-block;
  vertical-align: -3px;
  font-size: 16px;
}
.tags-view-wrapper .tags-view-item .el-icon-close:hover {
  background-color: #b4bccc;
  color: #fff;
}
</style>
